JP2021004199A - Liquid composition for skin cleansing - Google Patents

Abstract

To provide a liquid composition for skin cleansing which is used in an unconventional method.SOLUTION: A liquid composition for skin cleansing, which contains (A) a surfactant, (B) an amphiphilic ester and (C) a cold sense component, while being contained in a spray container, is capable of exhibiting excellent cleansing power, while being reduced in the skin irritancy of a liquid composition for skin cleansing, and is able to provide a novel use that is different from conventional uses in which the liquid composition for skin cleansing is foamed before application to the skin, said novel use being direct spraying of the liquid composition for skin cleansing onto the skin.SELECTED DRAWING: None

Description

The present invention relates to a liquid composition for skin cleansing, which can be washed without applying physical friction to the skin and also has a pleasant feeling of coldness.

Various skin cleansing compositions such as facial cleansers, body soaps, and shampoos are provided as products for the purpose of cleaning the skin and keeping the skin clean. In the mechanism by which the skin cleansing composition cleans the skin, the surfactant adsorbs to the dirt to reduce the surface tension between the dirt and water, and the mechanical force due to friction causes the dirt to float in the water. In order for such a cleaning mechanism to work effectively, it is necessary to add a surfactant at a critical micelle concentration or higher.

On the other hand, the detergency of the surfactant is too strong, which causes skin irritation, and as a result, skin troubles such as dry skin are caused. For this reason, various formulations have been proposed in which the combination of cleansing ingredients, the blending amount, and the like are devised for the purpose of making the action on the skin mild. Above all, since it is recognized that the foam formed during washing reduces the friction generated by direct contact between the skin and fingers, a formulation that improves foam quality such as foaming power and foam holding power is applied to the skin. It is common knowledge that it is excellent as a prescription that makes the action mild.

For this reason, in recent years, various pump former-type skin cleansers have been proposed, and attention is being paid not only to the ease with which high-quality foam can be easily obtained, but also to the gentleness to the skin. Specifically, in Patent Document 1, a liquid skin cleansing product comprising a former container and a liquid skin cleansing composition filled in the former container, wherein the liquid skin cleansing composition is (1). A) 3 to 10% by mass of a specific fatty acid salt having a linear or branched monovalent hydrocarbon group having 7 to 21 carbon atoms, and (B) specific dimethyldialyl ammonium chloride and acrylic acid and / or acrylamide. Liquid skin containing the copolymer of (C) and (C) sugar alcohol, and the mass ratio (A) / (B) of the content of the component (A) to the content of the component (B) is 20 to 250. Cleaning agent products are disclosed. Further, Patent Document 2 describes (a) 2 to 9% by mass of fatty acid salt, (b) 0.5 to 4% by mass of betaine lauryldimethylaminoacetate, and (c) one or more divalent alcohols. 1 to 10% by mass, and the sum (a) + (b) of the blending amount (mass%) of the component (a) and the component (b) is 3 to 10% by mass, and the blending amount ratio (b) A skin cleaning agent composition is disclosed, which comprises filling a former container with a cleaning agent having a / (a) of 0.1 to 0.5. Further, Patent Document 3 describes a former container containing (a) betaine lauryldimethylaminoacetate and (b) 4 to 15% by mass of a higher fatty acid soap having a specific composition and formed from a fatty acid having 5 to 25 carbon atoms. The cleaning agent composition discharged in the above is disclosed.

On the other hand, the skin after sunburn is inflamed, which can be said to be a kind of burn condition, and the barrier function and the ability to retain water are reduced as compared with normal skin. As a general treatment for the skin after sunburn, the affected area is cooled with water or ice, and an anti-inflammatory agent is applied. Further, Patent Document 4 describes that a composition containing a cooling agent dissolved in a solvent containing (R) -1,2-propanediol is used for treating the skin after sunburn. No. 5 describes the use of certain hydrated hemitatelate benzimidazol-2-ylpyrimidine compounds for the treatment of post-tanned skin.

International Publication No. 2014/003114 Japanese Unexamined Patent Publication No. 2016-098182 International Publication No. 2017/081897 Japanese Patent Publication No. 2014-508740 Special Table 2016-510752

The pumpformer-type skin cleansing composition contains a relatively small amount of surfactant, and in that respect, irritation to the skin is reduced as compared with the solid or semi-solid skin cleansing composition. It is thought that there is a tendency to be. On the other hand, since it is a major premise that the pump former type skin cleansing composition is discharged in the form of foam, the minimum amount of surfactant necessary for exerting the foaming force is blended. That is inevitable due to its composition.

In addition, various skin cleansing agents have been created for the purpose of removing body fluids such as sebum and sweat and dirt, except for skin cleansing agents for the purpose of removing makeup (cleansing), but all skin cleansing agents are without exception. It is premised on whipping before applying to the skin, and it is also common knowledge that whipping well before washing is preferable in terms of relieving friction on the skin. Foam can relieve physical friction by intervening between the skin and the hand, but since the foam itself is rubbed against the skin, it itself causes physical friction and is irritating to the skin. There is no change in being. In particular, irritation is still a concern for sensitive skin, such as sunburned skin, whose barrier function and water retention capacity are reduced due to inflammation.

As described above, there is a limit to the reduction of the burden on the skin of the skin cleansing agent by the same usage method as before. Therefore, it is considered necessary for the skin cleanser to reduce irritation to the skin more than ever so that it can be applied to sensitive skin such as after sunburn. Furthermore, for inflamed skin, it is required not only to keep it clean by washing, but also to suppress the burning caused by inflammation.

In addition, at beauty salons and beauty salons, facial cleansing treatments may be performed, and in order to improve the quality of service, gentle and comfortable cleansing treatments are desired even for sensitive skin such as after sunburn. ..

Therefore, an object of the present invention is to provide a liquid composition for skin washing that can be washed without applying physical friction to the skin and can impart a comfortable cooling sensation.

In order to further reduce irritation to the skin, the present inventor directly applies the skin cleansing liquid composition to the skin without foaming in advance when applying it to the skin, and cleanses without giving physical friction to the skin. I came up with the idea of a novel use of doing. Furthermore, by coexisting the amphipathic ester with the surfactant, the detergency can be effectively obtained without applying physical friction to the skin, and by further blending the cooling sensation component, a comfortable cooling sensation can be imparted. I found it. The present invention has been completed by further studies based on this finding.

That is, the present invention provides the inventions of the following aspects.
Item 1. A liquid composition for skin cleansing, which contains (A) a surfactant, (B) an amphipathic ester, and (C) a cooling sensation component, and is used for washing without giving physical friction to the skin.
Item 2. Item 2. The item (B) is selected from the group consisting of a dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester, a dicarboxylic acid dialkoxyalkyl ester, and a (icosane diic acid / tetradecane diic acid) polyglyceryl-10. Liquid composition for skin cleaning.
Item 3. Item 2. The liquid composition for skin cleansing according to Item 2, wherein the dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester is cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol.
Item 4. Item 2. The liquid composition for skin cleansing according to any one of Items 1 to 3, wherein the content of the component (A) is 0.025 to 2% by weight.
Item 5. Item 2. The liquid composition for skin cleansing according to any one of Items 1 to 4, wherein the content of the component (A) is 0.025 to 0.9% by weight.
Item 6. Item 8. The liquid composition for skin cleansing according to any one of Items 1 to 5, wherein the component (C) is menthol and / or menthol succinate.
Item 7. Item 2. The liquid composition for skin cleansing according to any one of Items 1 to 6, wherein the content of the component (C) is 0.001 to 0.5% by weight.
Item 8. Item 8. The liquid composition for skin cleansing according to any one of Items 1 to 7, which is applied to the skin after sunburn.
Item 9. A skin cleaning liquid composition containing (A) a surfactant, (B) an amphipathic ester and (C) a cooling sensation component is applied to the skin without giving physical friction to the skin. Skin cleaning method.

According to the liquid composition for skin cleansing of the present invention, it is possible to exert excellent cleansing power while reducing skin irritation, so that physical friction is applied to the skin without foaming in advance when applied to the skin. It can be washed without. Since it is possible to wash without applying physical friction to the skin, the amount of the surfactant compounded in the liquid composition for skin cleaning should be significantly reduced from the amount contained in the conventional liquid composition for skin cleaning. It is also possible to further reduce skin irritation. In addition, since it is possible to give a comfortable cooling sensation while reducing skin irritation, inflammation causes a decrease in barrier function and water retention ability, resulting in hypersensitivity and burning, as in the case of sunburned skin. It can be suitably used for cleaning the skin.

1. 1. Liquid composition for skin cleansing The liquid composition for skin cleansing of the present invention includes (A) a surfactant (hereinafter, may be referred to as (A) component) and (B) an amphipathic ester (hereinafter, (B). ) Component) and (C) Cooling sensation component (hereinafter, may be referred to as (C) component) are contained. Hereinafter, the liquid composition for skin cleansing of the present invention will be described in detail.

(A) Surfactant The liquid composition for skin cleansing of the present invention contains a surfactant as a component (A). The surfactant is not particularly limited, but preferably an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, a natural surfactant and the like can be mentioned from the viewpoint of suppressing irritation to the skin. As the surfactant, one of anionic surfactant, nonionic surfactant, amphoteric surfactant, and natural surfactant may be used alone, or two or more thereof may be arbitrarily combined. May be used.

Examples of the anionic surfactant used in the present invention include surfactants such as carboxylic acid type, sulfonic acid type, sulfate ester type and phosphoric acid ester type.

Specific examples of the carboxylic acid type surfactant include saturated or unsaturated fatty acids having 6 to 22 carbon atoms such as octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, and stearic acid; octanoyl groups and decanoyles. Examples include N-acylamino acids (carboxylic acid-type amino acid-based anionic surfactants) having saturated or unsaturated N-acyl groups having 8 to 24 carbon atoms such as groups, lauric acid groups, myristic groups, palmitic acid groups, and cocoyl groups. Be done. Examples of the N-acyl amino acid in the carboxylic acid type amino acid-based anionic surfactant include N-acylsarcosine, N-acylaspartic acid, N-acylglutamic acid, lauroylmethyl-β-alanine and the like. More specific carboxylic acid-type amino acid-based anionic surfactants include N-lauroyl sarcosine, N-lauroyl aspartic acid, cocoyl glutamic acid, and lauroyl methyl-β-alanine sodium.

Specific examples of the sulfonic acid type surfactant include an ester of a fatty acid having 6 to 22 carbon atoms such as cocoyl ISEthionic acid and isethionic acid; hexanesulfonic acid, octanesulfonic acid, decanesulfonic acid, dodecanesulfonic acid and the like. Alkyl sulfonic acid having 6 to 22 carbon atoms; Alkyl benzene sulfonic acid having an alkyl group having 10 to 16 carbon atoms such as alkylbenzene sulfonic acid; Carbon such as octanoyl group, decanoyle group, lauroyl group, myristoyl group, palmitoyl group, cocoyl group and the like. Examples thereof include N-acyl-N-methyltaurin (sulfonic acid type amino acid-based anionic surfactant) having a saturated or unsaturated N-acyl group of No. 8 to 24. More specific sulfonic acid-type amino acid-based anionic surfactants include N-myristoyl-N-methyltaurine, N-lauroylmethyltaurine, cocoylmethyltaurine and the like.

Specific examples of the sulfuric acid ester-type surfactant include esters of saturated or unsaturated fatty acids having 10 to 22 carbon atoms such as lauryl sulfuric acid and myristyl sulfuric acid and sulfuric acid. Specific examples of the phosphoric acid ester-type surfactant include esters of saturated or unsaturated fatty acids having 8 to 24 carbon atoms such as lauryl phosphate and phosphoric acid.

These anionic surfactants may be in the form of salts, for example, alkali metal salts such as sodium salt and potassium salt; triethanolamine (TEA) salt; ammonium salt and the like. it can.

Among these anionic surfactants, a carboxylic acid type surfactant and a sulfonic acid type surfactant are preferably mentioned, and more preferably, from the viewpoint of obtaining better skin irritation reducing property and detergency. Lauric acid, N-lauroyl aspartic acid, cocoyl glutamic acid, cocoyl methyl taurine and salts thereof are mentioned, and more preferably, sodium laurate, sodium N-lauroyl aspartate, cocoyl glutamate triethanolamine, sodium cocoyl methyl taurine are mentioned. Be done. Further, among these, N-acylglutamic acid having a saturated or unsaturated acyl group having 8 to 24 carbon atoms, fatty acid amide sulfonic acid having 8 to 22 carbon atoms, and the like, preferably from the viewpoint of obtaining better skin irritation reducing property. These salts are mentioned, more preferably cocoyl glutamic acid, cocoyl methyl taurine and salts thereof, and further preferably cocoyl glutamic acid triethanolamine, cocoyl methyl taurine sodium, and even better detergency is obtained. From the viewpoint, N-acylaspartic acid having a saturated or unsaturated acyl group having 8 to 24 carbon atoms is preferably mentioned, more preferably N-lauroyl aspartic acid is mentioned, and further preferably sodium N-lauroyl aspartate is mentioned. Can be mentioned.

These anionic surfactants may be used alone or in combination of two or more.

Examples of the nonionic surfactant used in the present invention include ester-type, ether-type, ester-ether-type, alkanolamide-type, alkylglycoside-type, and alcohol-type surfactants.

Specific examples of the ester-type surfactant include glycols dilaurate, glycol monostearate, glycol distearate, glyceryl monolaurate, glyceryl dilaurate, glyceryl monostearate, and glyceryl distearate, which have 8 to 20 carbon atoms. Saturated or unsaturated fatty acid and glycerin mono or diester; sorbitan fatty acid ester; sucrose fatty acid ester and the like.

Specific examples of the ether-type surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene polyoxypropylene glycol.

Examples of the ester-ether type surfactant include polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene hexitane fatty acid ester, and sorbitan fatty acid ester polyethylene glycol.

Specific examples of the alkanolamide type surfactant include cocamide DEA (coconut oil fatty acid diethanolamide), lauric acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide and the like.

Specific examples of the alkyl glucoside type surfactant include octyl glucoside, decyl glucoside, and lauryl glucoside.

Examples of the alcohol-type surfactant include cetanol, stearyl alcohol, and oleyl alcohol.

Among these nonionic surfactants, ester ether type surfactants and alkanolamide type surfactants are preferable from the viewpoint of obtaining better skin irritation reducing property and detergency. Preferred are polyoxyethylene cured castor oil and cocamide DEA, and more preferably polyoxyethylene cured castor oil.

These nonionic surfactants may be used alone or in combination of two or more.

Examples of the amphoteric tenside agent used in the present invention include surfactants such as alkyl betaine type, fatty acid amide propyl betaine type, and amine oxide type.

Specific examples of the alkyl betaine type surfactant include lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, octadecylaminomethyldimethylsulfopropyl betaine and the like.

Specific examples of the fatty acid amide propyl betaine type amphoteric tenside agent include amide betaine (amino acid-based amphoteric tenside agent) such as cocamidopropyl betaine, and sulfobetaine such as cocamidopropyl hydroxysultaine.

Specific examples of the amine oxide type amphoteric surfactant include lauryldimethylamine N-oxide and oleyldimethylamine N-oxide.

These amphoteric tenside agents may be in the form of salts, for example, alkali metal salts such as sodium salt and potassium salt; triethanolamine (TEA) salt; ammonium salt and the like. ..

Among these amphoteric surfactants, fatty acid amide propyl betaine type surfactants are preferable, and amide betaines such as cocamidopropyl betaine are more preferable, from the viewpoint of obtaining better skin irritation reduction property and detergency. Amino acid-based amphoteric surfactant), and more preferably cocamidopropyl betaine.

These amphoteric surfactants may be used alone or in combination of two or more.

Natural surfactants used in the present invention include lecithin and lysolecithin; saponins such as Kiraya saponin, soybean saponin, yukka saponin, enju saponin, beet saponin, azuxaponin, carrot saponin, tea species saponin, hechimasaponin, and tsubokusaponin. And so on.

Lecithin is a mixture of phospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol with components such as triglycerides, fatty acids, and carbohydrates from vegetable oils, and is a known component in pharmaceuticals, quasi-drugs, and cosmetics. is there.

The lecithin may be natural lecithin derived from animals and plants (for example, soybean lecithin, egg yolk lecithin, etc.) itself, a chemically treated product of natural lecithin, or a purified product of natural lecithin. .. Examples of the chemically treated product of natural lecithin include hydrogenated lecithin obtained by hydrogenation treatment (for example, fully hydrogenated lecithin and partially hydrogenated lecithin), hydroxylated lecithin obtained by hydroxylation treatment, and the like. Examples of the purified product of natural lecithin include lecithin in which the content of phosphatidylcholine is increased by a solvent such as acetone.

Examples of lysolecithin include lyso-forms of the above-mentioned lecithin (natural lecithin, chemically treated natural lecithin, purified product of natural lecithin). Lysolecithin has a structure in which the fatty acid at the 2-position of phosphatidylcholine is removed by hydrolysis (dissolution) of lecithin by an enzyme such as phospholipase A2.

Among these natural surfactants, lecithin, lysolecithin and saponin are preferably mentioned, more preferably lecithin and lysolecithin, and further preferably lysolecithin, from the viewpoint of obtaining better skin irritation reducing property and detergency. Can be mentioned.

These natural surfactants may be used alone or in combination of two or more.

The content of the component (A) in the liquid composition of the skin cleansing agent of the present invention is not particularly limited, and can be appropriately determined according to the cleansing power to be imparted. Since the skin cleansing liquid composition of the present invention can be washed without applying physical friction to the skin, the blending amount of the surfactant in the skin cleansing liquid composition can be adjusted to the conventional skin cleansing liquid. It can be significantly reduced from the blending amount contained in the composition, and even a small amount of surfactant that originally cannot exert effective detergency can effectively exert detergency. it can. From this point of view, the content of the component (A) in the liquid composition for skin cleansing agent of the present invention is preferably 0.025 to 2% by weight. Further, from the viewpoint of further suppressing the feeling of tension due to skin irritation and lack of moisturizing, the upper limit of the range of the content of the component (A) is 1.5% by weight or less, preferably 1% by weight or less, more preferably. 0.9% by weight or less, more preferably 0.6% by weight or less, still more preferably 0.2% by weight or less. On the other hand, from the viewpoint of obtaining more excellent detergency, the lower limit of the range of the content of the component (A) is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, still more preferably. Is 1.5% by weight or more, particularly preferably 1.8% by weight or more.

(B) Amphiphilic Ester The liquid composition for skin cleansing of the present invention contains an amphipathic ester as a component (B). The component (B) does not show a cleansing action by itself, but by coexisting with the component (A), the cleansing power of the liquid composition for skin washing can be improved while maintaining low irritation.

In the present invention, the amphipathic ester is dissolved in ion-exchanged water adjusted to a conductivity of 70 to 110 μs / m by 2% by mass or more at room temperature by the method specified in the General Test Method of the Japanese Pharmacy, and , Isotridecyl isononanoate (manufactured by Nisshin Oillio Group, Saracos 913), which is an oil agent, also dissolves in 10% by mass or more at room temperature (25 ° C.), and ester-based surfactants are excluded.

The amphoteric ester is not particularly limited, but from the viewpoint of obtaining better skin irritation reduction property and detergency, a dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester, a dicarboxylic acid dialkoxyalkyl ester, and (eicosandic acid) are used. / Tetradecanedioic acid) It is preferable that it is selected from the group consisting of polyglyceryl-10. As the amphoteric ester, any one of dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester, dicarboxylic acid dialkoxyalkyl ester, and (eicosandioic acid / tetradecanedioic acid) polyglyceryl-10 is used alone. Also, two or more kinds may be used in combination. Among these amphipathic esters, the dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester is more preferable from the viewpoint of obtaining better skin irritation reducing property and detergency.

The dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester used in the present invention is a diester compound of a dicarboxylic acid and a polyoxyalkylene alkyl ether. Specific examples of the dicarboxylic acid constituting the diester compound of the dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester include, for example, oxalic acid, malonic acid, succinic acid, tartrate acid, malic acid, glutaric acid, adipic acid, pemeric acid, and the like. Examples thereof include suberic acid, azelaic acid, sebacic acid, aspartic acid, glutamic acid, acetonedicarboxylic acid, phthalic acid, cyclohexane-1,4-dicarboxylic acid and the like. Examples of the polyoxyalkylene alkyl ether constituting the diester compound include polyoxyethylene monoalkyl ether, and more specifically, diethylene glycol monoethyl ether and triethylene glycol monoethyl ether. Be done.

Among these dicarboxylic acid bis (polyoxyalkylene alkyl ether) esters, a diester of cyclohexane-1,4-dicarboxylic acid and diethylene glycol monoethyl ether is preferable from the viewpoint of obtaining better skin irritation reduction property and detergency. Compound, specifically, INCI name (International Cosmetic Ingredient Dioldy and Handbook, 13th edition, Volume 1, CTFA, 2010, p.331): BIS-ETHOXYDIGLYCOLCYCOLTECYCLOHEXANE 1,4-DIC A compound called hexethoxy-1,4-dicarboxylic acid bisethoxydiglycol, and a diester compound of succinic acid and diethylene glycol monoethyl ether, specifically, INCI name (International Cosmetic Ingredient Dioldy and Handbook, 13th edition). , Volume 1, CTFA, 2010, p.331-332): BIS-ETHOXYDIGLYCOL SUCCINATE, a compound called bisethoxydiglycol succinate, more preferably cyclohexane-1. , 4-Dicarboxylic acid bisethoxydiglycol.

Further, in the present invention, specific examples of the cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol include, for example, "Neosolue-Aquio (trade name)" manufactured by Nippon Fine Chemical Co., Ltd. Further, specific examples of the bisethoxydiglycol succinate include "High Aquos Star DCS (trade name)" manufactured by Higher Alcohol Industry Co., Ltd.

These dicarboxylic acid bis (polyoxyalkylene alkyl ether) esters may be used alone or in combination of two or more.

The dicarboxylic acid dialkoxyalkyl ester used in the present invention is a diester compound of a dicarboxylic acid and an alkoxy alcohol. Specific examples of the dicarboxylic acid constituting the diester compound of the dicarboxylic acid dialkoxyalkyl include oxalic acid, malonic acid, succinic acid, tartaric acid, malic acid, glutaric acid, adipic acid, pemeric acid, suberic acid, and azelaic acid. Examples thereof include sebacic acid, aspartic acid, glutamic acid, acetonedicarboxylic acid, phthalic acid, cyclohexane-1,4-dicarboxylic acid and the like. Examples of the alkoxy alcohol constituting the diester compound include 2-methoxyethanol and 2-ethoxyethanol.

Among these dicarboxylic acid dialkoxyalkyl esters, a diester compound of succinic acid and 2-ethoxyethanol is preferable, specifically, diethoxyethyl succinate, from the viewpoint of obtaining better skin irritation reduction property and detergency. Can be mentioned.

These dicarboxylic acid dialkoxyalkyl esters may be used alone or in combination of two or more.

The polyglyceryl-10 (eicosanedioic acid / tetradecanedioic acid) used in the present invention is not particularly limited, but for example, "Neosolue-Aqua (trade name)" and "Neosolue-AquaS" manufactured by Nippon Seika Co., Ltd. Product name) ”and the like.

The content of the component (B) in the liquid composition for skin washing of the present invention is not particularly limited, and examples thereof include 0.1% by weight or more. From the viewpoint of obtaining better detergency and / or further reducing the feeling of tension due to insufficient moisturizing, the content of the component (B) is preferably 0.5% by weight or more, more preferably 1. 5% by weight or more, more preferably 3% by weight or more. The upper limit of the content of the component (B) is not particularly limited, but from the viewpoint of stability such as suppressing precipitation of the skin cleansing spray after high temperature storage, for example, 5% by weight or less, preferably 4% by weight. % Or less, more preferably 2% by weight or less, still more preferably 1.2% by weight or less, still more preferably 1% by weight or less.

In the liquid composition for skin cleansing of the present invention, the ratio of the component (A) to the component (B) is not particularly limited and is determined by each of the above-mentioned contents, but the skin irritation reducing property and the cleansing power can be obtained better. From the viewpoint, for example, 0.1 to 100 parts by weight of the component (B) may be mentioned with respect to 1 part by weight of the component (A). Further, from the viewpoint of obtaining better detergency when the component (A) is in a small amount of about 0.5 to 1.5% by weight, the component (B) is preferable with respect to 1 part by weight of the component (A). Examples thereof include 2 to 100 parts by weight, preferably 2.5 to 50 parts by weight, and more preferably 3 to 10 parts by weight. Further, from the viewpoint of further reducing the feeling of tension due to insufficient moisturizing, the component (B) is preferably 2 to 100 parts by weight, more preferably 2.5 to 90 parts by weight, and further, with respect to 1 part by weight of the component (A). Preferably, it is 3 to 80 parts by weight.

(C) Cooling sensation component The liquid composition for skin cleansing of the present invention contains a cooling sensation component as the component (C). The cold sensation component is not particularly limited as long as it is a component that brings about a cool sensation. Menthyl succinate, Menthyl glutarate, Ethylmentancarboxyamide, Mentancarbonylglycine ethyl ester, Menton, Mentongriserine acetal, 2-sec-butylcyclohexanone, Isopregol, Pregor, N, 2,3-trimethyl-2-isopropylbutanamide, Examples thereof include timol, eugenol, anetol, methyl salicylate, camphor, spiranthol, trimethylcyclohexanol, 3-mentoxy-2-methylpropan-1,2-diol and the like. One of these cooling sensation components may be used alone, or two or more thereof may be used in any combination.

Among these cooling sensation components, menthol and menthol succinate are preferably mentioned from the viewpoint of more effectively obtaining a comfortable cooling sensation, and a combination of menthol and menthol succinate is preferable from the viewpoint of maintaining the cooling sensation. Can be mentioned.

The menthol may be any of d-form, l-form, and dl-form, but l-form and dl-form are preferable, and l-form is more preferable. Further, as the menthol, an essential oil containing menthol may be used.

Monomentyl succinate is an ester of succinic acid and menthol, and the menthol may be any of d-form, l-form, and dl-form, but l-form and dl-form are preferable, and more preferable. Is l-body.

The content of the component (C) in the liquid composition for skin washing of the present invention may be appropriately determined according to the cooling sensation to be imparted, and is not particularly limited, but while imparting a comfortable cooling sensation. From the viewpoint of suppressing skin irritation caused by a cooling sensation component and from the viewpoint of stability such as suppressing offensive odor after high temperature storage, for example, 0.001 to 0.5% by weight can be mentioned. From the viewpoint of obtaining a more comfortable cooling sensation, the content of the component (C) is preferably 0.01 to 0.5% by weight, more preferably 0.1 to 0.5% by weight, and has a cooling sensation. From the viewpoint of further suppressing skin irritation caused by the ingredients or obtaining better stability after high temperature storage, preferably 0.001 to 0.3% by weight, more preferably 0.001 to 0.2% by weight. Can be mentioned.

Other Ingredients In addition to the above ingredients, the liquid composition for skin cleansing of the present invention contains other bases and additives required for formulation and the like as long as the effects of the present invention are not impaired. You may. Such additives are not particularly limited as long as they are pharmaceutically acceptable, but for example, water, lower alcohols having 1 to 5 carbon atoms (ethanol, isopropanol, etc.), and polyhydric alcohols (ethylene glycol, Aqueous bases such as 1,3-butylene glycol (1,3-BG), propylene glycol, isopropyl glycol, diethylene glycol, dipropylene glycol, polypropylene glycol, glycerin, etc.; preservatives (phenoxyethanol, methylparaben, propylparaben, benzoic acid, etc.) , Sodium citrate, sorbic acid, etc.), flavoring agents (citral, citroneral, farnesol, etc.), colorants (tar pigments (brown 201, blue 201, yellow 4, yellow 403, etc.), cacao pigments, chlorophyll, etc. , Aluminum oxide, etc.), Viscous agent (hydroxypropyl cellulose, hydroxyethyl cellulose, crosslinked acrylic acid polymer, carboxyvinyl polymer, hypromellose, polyvinylpyrrolidone, sodium alginate, ethyl cellulose, sodium carboxymethyl cellulose, xanthan gum, carrageenan, etc.), pH adjustment Agents (phosphate, hydrochloric acid, citrate, sodium citrate (trisodium citrate), succinic acid, tartrate, sodium hydroxide, potassium hydroxide, triethanolamine, triisopropanolamine, etc.), wetting agents (dl-pyrrolidone carboxylic) Sodium citrate solution, D-sorbitol solution, macrogol, etc.), stabilizers (dibutylhydroxytoluene, butylhydroxyanisole, sodium edetate, sodium metaphosphate, L-arginine, L-asparanic acid, DL-alanine, glycine, erythorbin Sodium acid, propyl citrate, sodium sulfite, sulfur dioxide, chlorogenic acid, catechin, rosemary extract, etc.), antioxidants, UV absorbers, chelating agents, adhesives, buffers, solubilizers, solubilizers, Examples include additives such as preservatives. These base materials and additives may be used alone or in combination of two or more. The contents of these base materials and additives can be appropriately set according to the formulation form and the like.

In addition to the above-mentioned components, the liquid composition for skin cleansing of the present invention may contain other pharmacological components, if necessary, as long as the effects of the present invention are not impaired. Examples of such pharmacological components include vitamins (vitamin A, vitamin B1, vitamin B2, vitamin B5, vitamin B6, vitamin B12, vitamin C, vitamin D, vitamin K, niacin). Kind, folic acid, biotin, lycopene, etc.), antihistamines (diphenhydramine, diphenhydramine hydrochloride, etc.), local anesthetics (procine, tetrakine, bupivakine, mepivacaine, chloroprocine, proparakine, meprilcaine or salts thereof, orthokine, oxesazein, oxypolyentoxy Decane, funnel extract, percamine pase, tesitdecitin, etc.), anti-inflammatory agents (indomethasin, fervinac, diclofenac sodium, loxoprofen sodium, etc.), skin protectants (corodione, sunflower oil, etc.) , Capsaicin, capsicum extract, etc.), mucopolysaccharides (sodium chondroitin sulfate, glucosamine, hyaluronic acid, cationized hyaluronic acid (dihydroxypropyltrimonium hyaluronate, etc.), etc.) and the like. These pharmacological components may be used alone or in combination of two or more. When these pharmacological components are contained, the content thereof may be appropriately set according to the type of the pharmacological component used, the expected effect, and the like.

Form The form of the liquid composition for skin cleansing of the present invention is liquid or gel at room temperature. The viscosity of the liquid composition for skin washing of the present invention is 10000 mPa · s or less, preferably 5000 mPa · s or less at 20 ° C. The viscosity is a value measured by a BL viscometer (rotor No. 3, 6 rpm, 20 ° C.).

Container The container for accommodating the liquid composition for skin cleaning of the present invention is not particularly limited as long as the liquid composition for skin cleaning can be directly applied to the skin from inside the container, for example, a spray-type container. , A pouring or dropping type container (particularly a washing bottle), and preferably a pouring or dropping type container (particularly a washing bottle) from the viewpoint of ease of treatment in an esthetic salon or a beauty salon. The spray container in the present invention discharges the contents in a mist state, and is different from the pump former container that discharges the skin cleansing liquid composition in a foam state.

In the present invention, the liquid composition for skin cleansing is contained in a spray container, a pouring or dropping container (particularly a washing bottle) in this way for skin washing without foaming before application to the skin. The liquid composition is applied directly to the skin. Therefore, it is easy to apply to the skin, and physical friction due to hands or the like at the time of application and / or physical friction due to bubbles during washing can be avoided. Examples of the spray type container include a pump type spray container which is a non-aerosol type spray container and an aerosol type spray container. Examples of the diameter (nozzle inner diameter) of the spray container include 0.01 to 3 mmφ, preferably 0.1 to 1 mmφ. When the spray type container is a pump type spray container, the injection amount per push is, for example, 0.05 to 1.2 g, preferably 0.1 to 0.3 g.

Uses The liquid composition for skin cleansing of the present invention is used for removing body fluids such as oils and fats and sweat on the skin, stains, etc., and is not used as a makeup remover (cleansing). The liquid composition for skin cleansing of the present invention is used for facial cleansing treatment in beauty salons and beauty salons. The liquid composition for skin cleansing of the present invention is used by applying it directly to the skin without diluting with water and without foaming. The amount used at one time depends on the concentration of the surfactant, the degree of stain, etc., but for example, when used for face washing, 0.5 to 3 g, preferably 1 to 2 g can be mentioned.

More specifically, the liquid composition for skin cleansing can be directly applied to the site to be washed from a spray container, a pouring or dropping container (particularly a washing bottle) without picking it up. In this way, by applying the skin cleansing liquid composition directly to the cleansing site, friction generated between the skin and hands of the cleansing site and friction generated between the skin and air bubbles of the cleansing site can be obtained. Cleaning can be performed simply by using the mechanical force of the liquid flow without giving any physical friction. Since the liquid composition for skin cleansing of the present invention is a formulation having excellent detergency, it is possible to cleanse the skin by using the mechanical force of the liquid flow without giving physical friction in this way. The burden on the skin is remarkably reduced, and an extremely gentle cleaning method becomes possible. Such a non-foaming cleaning method enables quick cleaning, and it is easy to realize that it is gentle on the skin with less surfactant, and it is easy to obtain satisfaction of consumers who are highly conscious of pursuing skin-friendly cleaning.

The site to be cleaned of the liquid composition for skin cleaning of the present invention is not particularly limited because it can clean any body part, and examples thereof include hands, hair, scalp, body, and face. Further, since the liquid composition for skin cleansing of the present invention can exert excellent cleansing power without giving physical friction to the skin, it is suitable for use on a face sensitive to irritation. Further, the liquid composition for skin cleansing of the present invention particularly applies to the skin having a reduced barrier function, the skin having a reduced ability to retain water, and the skin exhibiting hot spots as the skin condition of the part to be cleaned. Suitable. Preferred examples of skin exhibiting reduced barrier function, reduced ability to retain water, and burning are inflamed skin, and more preferred examples are skin after sunburn.

After washing, the skin cleansing liquid composition can be rinsed with water. Even when rinsing with water, wash it off using the mechanical force of the water stream so as not to give physical friction by hand. The water used for rinsing is also contained in a spray container, a pouring or dropping container (particularly a washing bottle), preferably a pouring or dropping container (particularly a washing bottle), and is to be washed in the same manner as the liquid composition for skin washing. It can be applied to the site.

Further, since the liquid composition for skin washing of the present invention can have an extremely low concentration of the surfactant, in this case, it is not necessary to wash off after washing. Therefore, the liquid composition for skin cleansing of the present invention is also suitable for cleaning in hospitals, skin cleansing treatments such as face washing in beauty salons and beauty salons, and disaster supplies. If it is not washed away, a water-absorbent base material such as a towel or tissue may be used to absorb and remove the liquid composition for skin washing remaining on the washing site without rubbing.

Production Method The liquid composition for skin cleansing of the present invention has a predetermined form by mixing the above-mentioned components (A), (B) and (C), and other components to be blended as necessary. Manufactured by preparing in.

2. 2. Skin Cleansing Method As described above, the amphipathic ester can improve the cleansing power of a skin cleansing composition containing a surfactant and a cooling sensation component without giving physical friction to the skin. Therefore, the present invention further comprises a liquid composition for skin cleaning containing a surfactant as a component (A), a cooling sensation component as a component (C), and an amphipathic ester as a component (B). Provided is a skin cleaning method including application to the skin without applying physical friction to the skin. The skin cleaning method of the present invention can be carried out as a cleaning treatment performed at an esthetic salon or a beauty salon.

The types and amounts of the components used in the skin cleansing method, the form of the skin cleansing composition, and the like are as shown in the column of "1. Liquid composition for skin cleansing".

The present invention will be described in more detail with reference to Examples below, but the present invention is not limited thereto.

[Reference test example]
Liquid compositions for skin cleansing having the compositions shown in Tables 1 to 4 were prepared. Details of each component shown in Tables 1 to 4 are as follows. The liquid compositions for skin cleansing shown in Tables 1 to 4 are liquid, and their viscosities at 20 ° C. (measured by BL viscometer (Brookfield B-type viscometer) rotor No. 3 and 6 rpm) are all 5000 mPa.・ It was in the range of s or less.
・ Sodium laurate (NOF CORPORATION "Non-Sal LN-1" (trade name))
・ Cocoyl glutamic acid TEA (Ajinomoto Co., Inc. "Amisoft CT-12S (trade name)")
・ Cocoyl methyl taurine Na (“Diapon K-SF (trade name)” manufactured by NOF CORPORATION)
-N-Lauroyl aspartate sodium solution (20% by weight) ("Aminoformer FLDS-L (trade name)" manufactured by Asahi Kasei Fine Chemicals Co., Ltd.)
-Polyoxyethylene lauryl ether acetic acid ("Kao Akipo RLM-45 (trade name)" manufactured by Kao Corporation)
・ Cocamide DEA ("Amisol CDE-G (trade name)" manufactured by Kawaken Fine Chemicals Co., Ltd.)
・ PEG-60 hydrogenated castor oil (polyoxyethylene hydrogenated castor oil; Nikko Chemicals Co., Ltd. “NIKKOL HCO-60 (trade name)”)
-Polyoxyethylene sorbitan monostearate (Leodol TW-S120V manufactured by Kao Corporation)
-Glycerin mono-2-ethylhexyl ether (SEPPIC "sensiva"
SC 50 JP (trade name) ")
・ Cocamidopropyl Betaine (“Softazoline CPB (trade name)” manufactured by Kawaken Fine Chemicals Co., Ltd.)
-Lauryl hydroxysulfobetaine solution (30% by weight) (Kao Corporation "Anhitor 20HD (trade name)")
・ Lysolecithin (“Resolecithin Kyowa (trade name)” manufactured by Kyowa Hakko Bio Co., Ltd.)
・ Kiraya extract (“Kiraya extract BG” manufactured by Maruzen Pharmaceuticals Co., Ltd., saponin content 5% by weight)
-Cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol (Nippon Fine Chemical Co., Ltd. "Neosolue-Aqulio (trade name)")
・ Bisethoxydiglycol succinate (“High Aquos Star DCS (trade name)” manufactured by Higher Alcohol Industry Co., Ltd.)

<Detergency evaluation>
Ten panelists specializing in cosmetics evaluation evaluated the cleansing power of the prepared liquid composition for skin cleansing. Specifically, each liquid composition for skin washing is contained in a pump-type spray container (“Z-155-C110 (trade name)” manufactured by Takemoto Yohki Co., Ltd., the injection amount per push is 0.15 g), and 1 It was applied by spraying 5.5 g directly onto the face. It was left for about 5 seconds, and then rinsed with water so that the hands did not touch the face. After holding down the face with a towel and absorbing water, the feeling of dirt removal on the skin was scored by sensory evaluation based on the following indexes.

5 points: Dirt removal was felt firmly 4 points: Dirt removal was felt 3 points: Neither 2 points: Dirt removal was not felt so much 1 point: Dirt removal was not felt at all

The scores obtained by the 10 panelists were totaled, and the degree of detergency was evaluated according to the following classification. The results are shown in Tables 1 to 4.
◎: 45 points or more
◯: 40 points or more and less than 45 points
Δ: 35 points or more and less than 40 points
×: Less than 35 points

<Evaluation of tension>
Ten panelists specializing in cosmetics evaluation evaluated the prepared liquid composition for skin cleansing for a feeling of tension. Specifically, each liquid composition for skin cleansing is contained in a pump-type spray container (Takemoto Yohki Co., Ltd. "Z-155-C110 (trade name)" (injection amount per push is 0.15 g). It was applied by spraying 1.5g directly onto the face. It was left for about 5 seconds, and then rinsed with water so that the hands did not touch the face. Hold the face with a towel to absorb the water, and then stretch it. The feeling was scored by sensory evaluation based on the following indexes. The stronger the degree of tension, the insufficient moisturizing.

5 points: No feeling of tension 4 points: Almost no feeling of tension 3 points: Feeling little tension 2 points: Feeling tension 1 point: Feeling strong feeling of tension

The scores obtained by the 10 panelists were totaled, and the degree of tension was evaluated according to the following classification. The results are shown in Tables 3-4.
◎: 45 points or more
◯: 40 points or more and less than 45 points
Δ: 35 points or more and less than 40 points
×: Less than 35 points

<Cold feeling evaluation>
The prepared liquid composition for skin cleansing was evaluated for cooling sensation by 10 people who spent the day outdoors when the ultraviolet rays were strong without using sunscreen and had their skin tanned. Specifically, each skin cleansing liquid composition is contained in a pump-type spray container (Takemoto Yohki Co., Ltd. "Z-155-C110 (trade name)" (injection amount per push is 0.15 g). It was applied by spraying 5 g directly on the whole body. It was left for about 5 seconds and then rinsed with water so that the hands did not touch the skin. After holding the skin with a towel and absorbing the water, a cold feeling Was scored by sensory evaluation based on the following indicators.

3 points: I feel a very comfortable cold feeling 2 points: I feel a comfortable cold feeling 1 point: I feel a slight cold feeling 0 points: I do not feel a cold feeling and I am not comfortable

The acquired scores of 10 people were totaled and averaged, and the degree of cold feeling was evaluated by the following classification. The results are shown in Tables 1 to 4.
◎: 2.5 points or more
◯: 1.5 points or more and less than 2.5 points
Δ: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Cultured epidermal skin irritation test (in vitro evaluation of skin irritation)>
The prepared liquid composition for skin washing was subjected to a cultured epidermal skin irritation test as follows.
1. 1. Preparation of Cultured Epidermis Model LabCite EPI-MODEL24 The assay medium was warmed and 0.5 mL each was added to a 24-well assay plate. Cultured epidermis model LabCite EPI-MODEL24 (lot number: LCE24-180226-A) was transferred to a 24-well assay plate supplemented with assay medium. After confirming that there were no bubbles on the bottom surface of the culture cup, the cells were placed in a CO ₂ incubator and allowed to stand for 1 hour or more until exposure to the test substance.

2. 2. Application and washing of test substance Twelve of the 24 epidermis models were used (the rest were pre-cultured until this test). A 24-well assay plate was removed from the CO ₂ incubator. The assay medium was warmed and 1.0 mL each was added to the third row of the 24-well assay plate. 25 μL of the test substance (each skin cleansing liquid composition) was added dropwise to the culture epidermis of the culture cup without using a pump-type spray container, and the whole was exposed. After 1 minute, 5 minutes and 10 minutes after exposure, the test substance was aspirated and removed, and the cultured epidermis model in the cup was washed with phosphate buffer (PBS) and transferred to the third row of the 24-well assay plate.

3. 3. MTT test The MTT test results from the reduction of MTT [3- (4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium bromide] taken up into cells by intracellular mitochondrial dehydrogenase. This is a method of measuring the viable cell ratio by extracting a formazan dye with an organic solvent and measuring the absorbance at 570 nm.

10 mL of MTT medium was prepared at a final concentration of 0.5 mg / mL. The MTT medium was warmed and 0.5 mL each was added to row 4 of the 24-well assay plate. The cultured epidermis model was transferred to row 4 of the 24-well assay plate and placed in a CO2 incubator for 3 hours MTT reaction. After completion of the MTT reaction, the cultured skin was picked up with tweezers and removed, and transferred to a 1.5 mL microtube. 300 μL of isopropanol was placed in a microtube and the cultured epidermis model was completely immersed. After that, it was allowed to stand for 2 hours, and the microtube was vortexed to extract the pigment. Extract (200 mL) was placed in each well of a 96-well plate. Further, as a blank (negative control), 200 μL of isopropanol was added to A1. Absorbance at 570 nm and 650 nm was measured with a microplate reader. The value obtained by subtracting the absorbance at 650 nm from the absorbance at 570 nm was used as the measured value, and the viable cell ratio of the test substance was calculated from the following formula.

The viable cell rate was classified based on the following criteria, and skin irritation was evaluated. The results are shown in Tables 3-4.
⊚: 90% or more
◯: 75% or more and less than 90%
Δ: 65% or more and less than 75%
×: 50% or more and less than 65% × ×: less than 50%

As shown in Tables 1 to 4, no detergency was observed in the liquid composition for skin cleaning (Reference Comparative Examples 1 to 10) containing the surfactant alone at a concentration of 0.025 to 2% by weight. On the other hand, a liquid composition for skin cleansing (Reference Examples 1 to 20) containing an amphipathic ester (Reference Comparative Examples 11 to 15) which does not show detergency by itself together with 0.025 to 2% by weight of a surfactant. ), An excellent detergency was obtained by simply applying it directly to the skin by spraying from a spray-type container, without giving any physical friction, and by using the mechanical force of the liquid flow. In other words, it was shown that skin-friendly cleansing is possible.

As shown in Reference Examples 1 to 3, a liquid composition for skin cleansing containing a surfactant alone in an amount of more than 2% by weight can also obtain excellent cleansing power simply by directly applying it to the skin by spraying. On the other hand, in consideration of skin irritation due to the surfactant concentration shown in Reference Examples 1 to 3, when the surfactant concentration is set to 2% by weight or less as shown in Reference Examples 9 to 20, not only the detergency but also the detergency is obtained. Excellent hypoallergenicity was also achieved. That is, by setting the surfactant concentration of the liquid composition for skin cleaning applied to the cleaning method applied directly to the skin by spraying to 0.025 to 2% by weight, it is physically and chemically gentle on the skin. It was shown that cleaning is possible. On the other hand, none of the skin cleansing composition of Reference Examples 1 to 20, Reference Comparative Examples 1 to 15 and Reference Examples 1 to 3 was comfortable due to a feeling of coldness.

[Test example]
Liquid compositions for skin cleansing having the compositions shown in Tables 5 to 7 were prepared. Details of each component shown in Tables 5 to 7 are as shown in the reference test example. Further, l-menthol was used as the menthol, and an ester of succinic acid and l-menthol was used as the menthyl succinate. The liquid compositions for skin cleansing shown in Tables 5 to 7 are liquids, and their viscosities at 20 ° C. (measured by BL viscometer (Brookfield B-type viscometer) rotor No. 3 and 6 rpm) are all liquid. It was in the range of 5000 mPa · s or less.

<Detergency evaluation>
The prepared liquid composition for skin cleansing was evaluated for its cleansing power by 10 people who spent the day outdoors when the ultraviolet rays were strong and had sunburned skin. Specifically, each liquid composition for skin washing is contained in a pump-type spray container (injection amount per push of "Z-155-C110 (trade name)" manufactured by Takemoto Yohki Co., Ltd. is 0.15 g) and 5 g. Was applied by spraying directly onto the entire body. It was left for about 5 seconds, and then rinsed with water so that the hands did not touch the skin. After holding down the skin with a towel and absorbing water, the feeling of dirt removal on the skin was scored by sensory evaluation based on the following indexes.
3 points: Dirt removal was felt firmly 2 points: Dirt removal was felt 1 point: Dirt removal was slightly felt 0 points: Dirt removal was not felt at all

The acquired scores of 10 people were totaled and averaged, and the degree of detergency was evaluated according to the following classification. The results are shown in Tables 5-7.
◎: 2.5 points or more
◯: 1.5 points or more and less than 2.5 points
Δ: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Stimulation evaluation>
The prepared liquid composition for skin cleansing was evaluated for irritation by 10 people who spent the day outdoors during the period when ultraviolet rays were strong and had sunburned skin. Specifically, each skin cleansing liquid composition is contained in a pump-type spray container (Takemoto Yohki Co., Ltd. "Z-155-C110 (trade name)" (injection amount per push is 0.15 g). It was applied by spraying 5 g directly on the whole body. It was left for about 5 seconds and then rinsed with water so that the hands did not touch the skin. After holding the skin with a towel and absorbing the water, a feeling of irritation Was scored by sensory evaluation based on the following indicators.

3 points: No stimulus was felt 2 points: Slight stimulus was felt 1 point: Stimulus was felt 0 point: Stimulus was strongly felt

The acquired scores of 10 people were totaled and averaged, and the degree of irritation was evaluated according to the following classification. The results are shown in Tables 5-7.
◎: 2.5 points or more
◯: 1.5 points or more and less than 2.5 points
Δ: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Evaluation of tension>
The prepared liquid composition for skin cleansing was evaluated by 10 people who had sunburned skin after spending time outdoors during the daytime when the ultraviolet rays were strong without using sunscreen. Specifically, each skin cleansing liquid composition is contained in a pump-type spray container (Takemoto Yohki Co., Ltd. "Z-155-C110 (trade name)" (injection amount per push is 0.15 g). It was applied by spraying 5g directly on the whole body. It was left for about 5 seconds and then rinsed with water so that the hands did not touch the skin. After holding the skin with a towel and absorbing the water, it felt taut. Was scored by sensory evaluation based on the following indexes. The stronger the degree of tension, the less moisturizing.

3 points: I didn't feel any tension 2 points: I felt only a little tension 1 point: I felt tension 0 points: I felt a strong feeling of tension

The acquired scores of 10 people were totaled and averaged, and the degree of tension was evaluated by the following classification. The results are shown in Tables 5-7.
◎: 2.5 points or more
◯: 1.5 points or more and less than 2.5 points
Δ: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

<Cold feeling evaluation>
The prepared liquid composition for skin cleansing was evaluated for the degree of cooling sensation in the same manner as in the reference test example. The results are shown in Tables 5-7.

<High temperature stability evaluation>
The prepared liquid composition for skin cleansing was stored at room temperature or under 50 ° C. conditions for 1 week. After storage, visually observe the difference in appearance and odor between the skin cleansing liquid composition stored at room temperature and the skin cleansing liquid composition stored under 50 ° C. conditions, and evaluate the high temperature stability based on the following indexes. Scored at. The difference in appearance and odor is the precipitation (specifically, the precipitation of bisethoxydiglycolcyclohexane-1,4-dicarboxylic acid) and the offensive odor (specifically) in the liquid composition for skin washing stored under the condition of 50 ° C. The offensive odor caused by menthol and menthyl succinate) is evaluated.

3 points: No difference was observed 2 points: Only slight difference was observed 1 point: Difference was observed 0 point: Large difference was observed

The acquired scores of 10 persons were totaled and averaged, and the degree of formulation stability was evaluated according to the following classification. The results are shown in Tables 5-7.
◎: 2.5 points or more
◯: 1.5 points or more and less than 2.5 points
Δ: 0.5 points or more and less than 1.5 points
×: Less than 0.5 points

As shown in Tables 5 to 7, in the liquid composition for skin cleansing (Comparative Example 1) containing the surfactant alone, the cleansing power was not recognized because the concentration of the surfactant was too low. Further, in the liquid composition for skin cleaning (Comparative Example 2) containing an amphipathic ester (Comparative Example 3) which does not show detergency by itself together with a surfactant, a spray container even if the concentration of the surfactant is low. By simply applying it directly to the skin by spraying from the skin, excellent detergency was obtained just by using the mechanical power of the liquid flow without giving any physical friction, but it was tanned in terms of cold feeling. It wasn't comfortable on the skin. On the other hand, in the liquid composition for skin cleaning (Examples 1 to 20), which contains an amphipathic ester which does not show detergency by itself together with a surfactant and also contains a cooling sensation component, the concentration of the surfactant is low. However, it is possible to perform skin-friendly cleaning by simply applying it directly to the skin by spraying from a spray-type container, without giving any physical friction, and by using the mechanical force of the liquid flow to obtain excellent cleaning power. At the same time, it was able to give a pleasant cold feeling to the sunburned and hot skin.

In addition, all the liquid compositions for skin cleansing of Examples and Comparative Examples were stable at room temperature with no precipitates or offensive odors. On the other hand, regarding the high temperature stability (formulation stability after storage at 50 ° C.), precipitation of an amphoteric ester was observed in the skin cleansing liquid composition of Example 21, and in the skin cleansing liquid composition of Example 22. Although an offensive odor of menthol was observed, the liquid compositions for skin washing of Examples 1 to 20 were also excellent in terms of high temperature stability.

[Prescription example]
The liquid skin cleansing liquid compositions of the formulations shown in Table 8 were prepared. All of the liquid compositions for skin cleansing of any formulation had low skin irritation and had excellent cleansing power, were able to impart a pleasant cooling sensation, and were also excellent in stability at room temperature and high temperature.

Claims (9)

A liquid composition for skin cleansing, which contains (A) a surfactant, (B) an amphipathic ester, and (C) a cooling sensation component, and is used for washing without giving physical friction to the skin. The first aspect of claim 1 is that the component (B) is selected from the group consisting of a dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester, a dicarboxylic acid dialkoxyalkyl ester, and a (icosane diic acid / tetradecane diic acid) polyglyceryl-10. The liquid composition for skin cleaning described. The liquid composition for skin cleansing according to claim 2, wherein the dicarboxylic acid bis (polyoxyalkylene alkyl ether) ester is cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol. The liquid composition for skin cleansing according to any one of claims 1 to 3, wherein the content of the component (A) is 0.025 to 2% by weight. The liquid composition for skin cleansing according to any one of claims 1 to 4, wherein the content of the component (A) is 0.025 to 0.9% by weight. The liquid composition for skin cleansing according to any one of claims 1 to 5, wherein the component (C) is menthol and / or menthol succinate. The liquid composition for skin cleansing according to any one of claims 1 to 6, wherein the content of the component (C) is 0.001 to 0.5% by weight. The liquid composition for skin cleansing according to any one of claims 1 to 7, which is applied to the skin after sunburn. A skin cleaning liquid composition containing (A) a surfactant, (B) an amphipathic ester and (C) a cooling sensation component is applied to the skin without giving physical friction to the skin. Skin cleaning method.